Mongodb remove duplicates MongoDB boasts aggregation operations, which group values from multiple documents together, and can perform a variety of operations on the grouped data to return a single result. You can view your data directly, interact with your collections, and much more with this helpful extension! Nov 3, 2021 · Remove duplicate in MongoDB. Load 7 more related questions Mar 8, 2023 · Method 2: Find Duplicate Record Ids and Remove by Id I found this method in ChatGPT . 10. 0. When I say duplicates I don't mean that the whole document is the same. Nov 11, 2021 · Check and remove duplicates in python MongoDB. I am not sure about your deleteMany. unwind and group for the nested array objects in Jan 16, 2015 · If you are going to iterate all the documents anyway, I think a more straightforward approach would to iterate sorted by the id field (assuming that's the field that wants to be unique) and remove() duplicate documents (where the current id matches the previous one seen). how to delete duplicates record from a mongodb database. Remove May 12, 2020 · How to remove duplicate values inside a list in MongoDB? How to remove duplicate property values in array – JavaScript? How to group nested fields in MongoDB aggregation with count value in array? Apr 28, 2022 · how to find and remove duplicates documents from mongodb using python. Feb 19, 2013 · I have tons of data in my database. dropDups:true But later this feature has been discarded since version 3. MongoDB Distinct Count issue. Background. 123 abc. I tried db. How to remove duplicates based on a key in Mongodb? 1. In the documents we will have 100 attributes so we can not find documents based on few attributes. To ensure there is no Aug 2, 2022 · As mentioned by @turivishal, if this is a one-time process vs a regular use-case will most likely be different. We need to divide the task into two parts to remove duplicate entries from the database. Sep 4, 2016 · Remove Duplicates on mongodb. Duplicating data can remove the need to perform joins across multiple collections, which can improve application performance. 2 Remove duplicate records from Jun 4, 2014 · Remove Duplicates from MongoDB. i want to remove all my duplicates and keep only one duplicate May 9, 2016 · i have a mongoDB collection with more that 5 millions records. Dec 28, 2017 · MongoDB - Remove duplicates in query. Aug 1, 2022 · Hi Team, We’re trying to find duplicates methods in our collection with about 2 or 3 millions of documents, we have tried this way but this seems slow and cannot be ideal when deploying to production, do you know what’s the best and fastest way to delete duplicate records with million of data. I have a large collection (~2. Do you have a question or a suggestion about this post? Contact me! Apr 17, 2021 · How do I remove duplicates in mongodb based on multiple fields? 1. Apr 23, 2020 · I have to update all the documents which have duplicate status names in statuses array, to remove all duplicate entries. Jul 18, 2021 · When web-scraping my code is sometimes fetching duplicate entries to MongoDB Realm. Removing duplicates by a key for mongo > 3. I tried running ensureIndex({id:1}, {unique:true, dropDups:true}) on the collection. yourCollectionName. Viewed 315 times If you ever find yourself in a position where you need to remove duplicate entries on a MongoDB collection, as per version 3. Find and delete duplicate Entries in an embedded Array. Handling duplicate data effectively requires a combination of strategies: Mar 8, 2014 · MongoDB - How to remove duplicates. Aug 1, 2016 · Remove duplicate array objects mongodb. How do i remove the duplicate records from the entire collection? the record are getting inserted with the following structure { item: "journal", qty: 25, size:15 , status: "A" } All i need is to have unique records for one document. MongoDB Finding duplicates sharing multiple fields using MapReduce. Or else you can get a dump of that collection then remove all documents from that old collection. In this case, I want to fil Jun 4, 2021 · MongoDB how to remove duplicates on aggregate [duplicate] Ask Question Asked 3 years, 7 months ago. Mongo remove duplicates in array of objects based on field. How do I group on a field, while ignoring duplicates from another field? 0. May 7, 2024 · In this article, we'll explore how to remove duplicates using the $unionWith aggregation stage in MongoDB. ; Then group again to project all the duplicate names as an array. Jun 7, 2021 · On creating an unique index, MongoDB used to have a feature to automatically remove the documents which have duplicated index fields. MongoDb aggregation delete May 30, 2019 · How can I delete duplicates in MongoDb? 63. Remove duplicated objects from MongoDB query results. Feb 27, 2014 · IMPORTANT: The dropDups option was removed starting with MongoDB 3. This step-by-step guide will show you how to identify and remove duplicate records from your MongoDB database, so you can keep your data clean and organized. Mar 8, 2022 · MongoDB remove duplicate subdocuments inside array based on a specific field. Aug 9, 2016 · Map reduce to delete duplicates (mongodb) 0. Aug 2, 2022 · I’m trying to remove duplicates of documents, in the collection the collection have millions of records and duplicates data I assume have 100k records. I am using mongodb 4. Modified 10 years, 7 months ago. My data is a comment feed from a web scraping application and I need to prevent duplicate entries from being added. x, so this solution is only valid for MongoDB versions 2. Example: Duplicate Data in an E-Commerce Schema Mar 31, 2020 · New to Mongo, have found lots of examples of removing dupes from arrays of strings using the aggregation framework, but am wondering if possible to remove dupes from array of objects based on a fie Aug 21, 2014 · How can I remove a duplicate object from a MongoDB array? 0. Delete all but one MongoDb aggregation delete duplicates according to parameter. Delete Duplicates by Query. As a result, we now have duplicate objects in our documents due to addToSet seeing the order of objects as unique event thought the data may be the same. sort() applied within the cursor iteration for the returned array: Using the _id Value Aug 2, 2022 · I’m trying to remove duplicates of documents, in the collection the collection have millions of records and duplicates data I assume have 100k records. Apr 13, 2020 · MongoDB - remove duplicate values in group by list. Unfortunately, I am rather new to using MongoDB and do not know how to express this in a query. 4. How to remove duplicates based on property after May 26, 2019 · Remove Duplicates; My current implementation of removing duplicates is as follows. mongodb aggregate distinct count. We need query-based deletion. Jul 5, 2022 · I am trying to delete records based on the following criteria: Any duplicate record based on "data. x? 2. So it would be nice to know. and i have so many duplicates in it. . Jul 2, 2022 · Remove duplicates from MongoDB 4. In this tutorial, we will show you how to identify and remove duplicate records in MongoDB using three different methods: We will also show you how to remove duplicate records using the `delete ()` method, the `update ()` method, and the `aggregate ()` pipeline. Finding duplicate values in a MongoDB array. 7. The find commands won't work as you need remember that it's returning a cursor to the client and as such, can't reduce the results to only those documents that are unique without a secondary pass. Please change collectionName and the fields for _id , which are supposed to be unique, to your needs accordingly. Remove Duplicates on mongodb. but for documents with cusId 1, there should be 2 duplicates (all documents with cusId 1 except the last inserted document) so the final result should be all duplicates except the last inserted document Jul 9, 2018 · Remove duplicates from MongoDB 4. The index creation is quite slow, takes about 2 hours despite using most of the RAM and it is erroring out at 99% saying there is a dupe key. Mongodb: Need to aggregate and perform deduplication considering a nested value. How to count array May 19, 2017 · Remove Duplicates on mongodb. Is there any simple way to do it through Mongo native update query(not javascript)? Jan 12, 2024 · But nonetheless, deleting by _id provides an absolute removal mechanism when duplicate ids surface. Aug 21, 2014 · The last form could be useful to you if you actually want to "remove" the duplicates from your data with another update statement as it identifies the elements which are duplicates. createIndex({'indexname':1},unique:true),and insert your documents from previous collection to new collection and since key you wanted to be distinct or duplicates removed will Dec 1, 2021 · Hello everyone, I’ve been using influxdb for time series for the last past year but I wanted to try mongo time series recently. Ask Question Asked 7 years, 5 months ago. and I’ve been doing some tests however I couldnt find out why it allows duplicate values and a way to prevent it. Modified 3 years, 7 months ago. remove document objectid only in populated array in mongoose. How can i delete those documents. Viewed 1k times 1 I would like to remove duplicates on Nov 9, 2022 · I need to delete my duplicate documents in database. var duplicates = []; db. Of course manually capturing ids to remove duplicates doesn‘t scale well. mongoresore will not add duplicate collections. These duplicates can occur due to various reasons such as data import errors, application bugs, or inconsistent data entry. Aug 7, 2018 · Remove Duplicates on mongodb. It looks like you might delete only one of the duplicates, because you are deleting _id:doc. You can go for Aggregation and write script to remove dups. Feb 2, 2024 · In this article, we are going to see how we can remove duplicate entries in MongoDB, and also we are going to see an example with a proper explanation to make the topic easier. from that i need to delete the duplicate entries. Use update with upsert=true. Group all the records having similar name. Counting distinct values in MongoDB. Python-How to find duplicated name/document in mongo db? 1. ensureIndex({beatmapset_id: 1}, {unique: true, dropDups: true}) but it leaves a random document and I want the condition above. How to remove duplicate record in MongoDB 3. Mongo churns away at it for a while before it decides that too many dups on index build with dropDups=true . I'm doing this by using the following function Nov 19, 2010 · Fastest way to remove duplicate documents in mongodb. 126 abc. Is it possible to remove duplicates, leaving the bottom entry as the valid object? Oct 16, 2019 · MongoDB - Remove duplicates in query. I use the aggregate function to find multiple entries for the same email-> find all entries with that email and associated numbers and then output these to a new collection called duplicates using the following command: Remove duplicate in MongoDB. Remove duplicate in MongoDB. How to remove duplicates with a certain condition in mongodb? 0. Remove duplicates from MongoDB 4. Feb 17, 2014 · MongoDB query to remove duplicate documents from a collection. Jan 4, 2022 · By this merge the posts field contains all the 5 posts, including duplicates (the post with "text": "all day long I dream about"). 0 is simple. I have a large collection of about 300M documents and I want to add an unique index on a collection. update(), You can still do this using . If you don't care about "identifying" the documents that contain duplicate array entries and are prepared to "blast" the whole collection with updates, then just use python . 7. x and before. How to take the duplicate records in mongodb. Delete all but one duplicate from a mongo db. We'll cover the concepts, syntax, and practical examples to demonstrate its usage and effectiveness. 0. 125 abc. So in that last form the returned result from your sample data identifies the duplicate: Feb 4, 2019 · i have a collection which has duplicate records. The script simply find the ids of duplicate records, then delete duplicate records by ids. 2. How to remove Jan 8, 2025 · Remove Duplicates: After identifying duplicates, you can remove them using the deleteMany method. This behaves in a similar way to SQL’s UNION Apr 18, 2022 · I need to remove all duplicates using the id field. Is there a better and fast way to remove duplicates in a collection? Oct 7, 2021 · for instance, for documents with cusId 4 and 5, there are no duplicates for this cusId so they should not be included in the duplicates array. Jan 11, 2016 · Remove Duplicates from MongoDB. How can I check for duplicate documents in Mongoose? 0. Merge duplicates and remove the oldest. collectionname. For continuously preventing duplicates, you might want to create a unique index on notifId,empId and date. Oct 16, 2024 · Recently we found that a new developer implemented addToSet versus set when updating info in a collection. e. MongoDB query to find document with duplicate value in array. Please refer to the documentation here ObjectId MongoDB: How to remove duplicate records from a query? 0. Hot Network Questions Elegant way to maximizing linear function subject to being on the surface of a May 30, 2020 · MongoDb aggregation delete duplicates according to parameter. MongoDB remove duplicate subdocuments inside array based on a specific field. 127 pqr. Feb 16, 2023 · Use the following MongoDB operations to identify duplicate documents in your collections, and remove them safely. Remove all documents in one go. 20. You can find the list of duplicate names using the following aggregate pipeline:. The idea would be that if two documents had the same "should_be_unique" value, and both had "dev_type" set to "Bar," then the total for "Bar" would be 6 instead of 7, reducing as a result of the duplicate. Feb 29, 2012 · To find duplicates in MongoDB, we would tackle the problem in a similar way. 1 How to eliminate duplicates in your results. Finding duplicates in mongo. Related. Jul 22, 2015 · If you want to remove the "duplicates" from a collection then your best bet is to run an aggregation query to determine which documents contain "duplicate" data and then cycle through that list removing "all but one" of the already "unique" _id values from the target collection. Jun 17, 2015 · Probably should add the "for python" note here as well. Apr 4, 2024 · How to Find Duplicates in MongoDB? Duplicates in a MongoDB collection refer to multiple documents sharing the same values in one or more fields. set() in the client code to remove the duplicates: Jun 4, 2021 · I am trying to find out how I can make a mongodb aggregation to delete duplicate documents according to a specific parameter. 0 Delete all but one duplicate from a mongo db . with the same metadata and everything Jan 4, 2020 · Remove duplicate array objects mongodb. deleteMany({ fieldName: "duplicateValue" }) MongoDB Duplicate Data Handling Techniques. Update will look for the document that matches your query, then it will modify the fields you want and then, you can tell it upsert:True if you want to insert if no document matches your query. after that add unique index to the collection and then restore the collection back. so need to find those duplicate document/records and delete from same collection. Ask Question Asked 10 years, 7 months ago. 124 abc. Delete duplicate entries inside list by combination Don't use insert. Hot Network Questions Apr 11, 2014 · You can't do a reduction and eliminate duplicate documents using just find with MongoDB and a projection. At this point I wish to remove duplicates for posts. How can I make my MongoDB database contain only unique entries and remove duplicates? Below is the code from MongoDB Realm: Nov 17, 2022 · Remove duplicate documents from Mongodb by keys Posted on 2022-11-17 | Edited on 2024-07-16 | 0 Comments. May 15, 2020 · How to remove duplicates from MongoDB Collection - For this, set “unique:true” i. I want to remove all these duplicates and keep only one data from it, For example i have data like this in my login object. 1. Hot Network Questions Book series with two male protagonists, one embodying the moon and the other the sun Ways to travel across Sep 7, 2022 · How can I delete duplicates in MongoDb? 11. 7 million documents) in mongodb, and there are a lot of duplicates. Now lets see how we can create unique key when there are duplicate entries/documents already present inside the collection. Find duplicate values inside an array in Mongo DB but it can be present outside object. And is actually my answer ( and your the second person to reference this week, and yet no votes received for useful! Hmm! ), where it's just a simple . Modified 7 years, 4 months ago. That will avoid the overhead of re-inserting documents that will result How can I delete duplicates in MongoDb? 27. Remove Duplicates from MongoDB. And seems dropDupes option Mar 7, 2016 · Remove Duplicates from MongoDB. 2 How to remove duplicate entries by two keys in mongodb? 1 May 20, 2018 · MongoDB - Remove duplicates in query. Remove Duplicate Documents: MongoDB We learnt how to create unique key/index using {unique: true} option with ensureIndex() method. Here, duplicate insertio Learn how to remove duplicate records in MongoDB using a simple query. dups[0]. id name. If I manually try to delete the key, it is taking hours. How to remove duplicate entries from an array? 1. 3. 0 you will need to use Aggregation . aggregate([ { $match: { name: { "$ne": '' } // discard selection criteria }}, { $group: { _id: { name: "$name"}, // can be grouped on multiple properties dups: { "$addToSet": "$_id" }, count: { "$sum": 1 } }}, { $match: { count: { "$gt": 1 } // Duplicates considered as count Feb 3, 2024 · This tutorial covers various methods to remove duplicate documents in MongoDB, ranging from simple queries to more complex aggregation processes. db. ; Match those groups having records greater than 1. May 17, 2022 · I am currently trying to prevent duplicate data in one particular field from being entered into my database. 10 Remove duplicate documents based on field . Nov 17, 2021 · You can use the following syntax to find documents with duplicate values in MongoDB: MongoDB: How to Remove a Field from Every Document; MongoDB: How to Sort by Learn MongoDB - Remove docs that have a duplicate field in a collection (dedupe) May 12, 2015 · pip install mongo_remove_duplicate_indexes. 2 Remove all Duplicates except the most recent document. I tried creating a unique index in MongoDB compass, but it seems that the data input stops upon finding the duplicate data. This method involves identifying unique documents based on a key (s) and then deleting duplicates. There is no direct replacement for the dropDups option. How to eliminate duplicates in your results. Viewed 3k times 1 I have a collection which have many Mar 30, 2021 · I have an mongo instance (about 120GB RAM, 250GB SSD) running 4. These documents have the same key beatmapset_id I want to delete all duplicates but leave the document with the most difficultyrating. 6. T… Jul 30, 2021 · In MongoDB, the $unionWith aggregation pipeline stage performs a union of two collections, and it includes duplicates. 128 pqs. I feel like the current most popular answer is a little too local and detailed for such an elementary MongoDB operation - removing duplicates from mongo by a key. Delete duplicate entries inside list by combination of fields with MongoDB query. How to remove duplicates with a certain condition in mongodb? 11. Removing duplicates in MongoDB 4 from millions/billions of records. x? How to Remove Duplicate Values from Slice in Golang? How to remove duplicate property values in array – JavaScript? How to remove duplicate entries by two keys in MongoDB? How to Count Unique Values Inside a List in Python? C# program to remove duplicate elements from a List; Java program to MongoDB 删除重复值在本文中，我们将介绍如何在 MongoDB 中删除重复值。MongoDB是一个开源的NoSQL数据库，它提供了丰富的功能和灵活的数据模型。有时候，在我们的数据集中会存在一些重复值，这可能会影响我们的查询结果和数据分析的准确性。 Jan 31, 2022 · To connect to your cluster, we'll use the MongoDB for Visual Studio Code extension (VS Code for short 😊). I have a collection in mongodb where every document has a duplicate. insertMany() by passing in a flag ordered in options to query : Jun 2, 2017 · I've tried a few options, but for the best of me I can't figure out the cleanest way to alter such a query while also eliminating duplicates. Any status which appeared first should stay and all other duplicates should be removed. MongoDB MongoDB中的去重方法在本文中，我们将介绍如何在MongoDB中去除重复数据。 MongoDB是一种NoSQL数据库，被广泛用于存储和处理大规模数据。当我们在数据库中存储数据时，有时候会因为某些原因导致出现重复的数据，在处理大量数据的场景下，这可能会导致 Dec 17, 2018 · Remove duplicate in MongoDB. best way will be to create a python script or in any language you prefer,iterate the collection ,create new collection with a unique index set to true with db. MongoDB - remove duplicate values in group by list. For example I have the following documents: Oct 18, 2021 · If you prefer something more visual, you can use MongoDB Compass and create the aggregation pipeline: You can now remove the duplicate keys and add the unique index. There are 76 keys in each document and each one has one duplicate. 1 MongoDB Find documents which have duplicate propety values. collection. Basically I’m writing data in bulk every few minutes and usually 1 minute of data is duplicate in the batch. Nov 4, 2018 · Using query aggregation I want to create a new array by a filter of another array, so that the filtered result will be done by a specific field of the preliminary array. We have total 7 documents/records out of 2 documents/records are duplicate. Ensure to keep one instance of the duplicate entries based on your criteria. Find duplicates across multiple MongoDb collections. Filter out duplicates on add to Mongoose MongoDB. Related The performance benefit for reads when data is duplicated. I did use aggregation to delete those duplicates, but it is slow and is not ideal when we deploy it to prod. here is the code which i tried, from pymongo import MongoClient conn= White Papers & Presentations. ensureIndex({yourFieldName: 1}, {unique: true, dropDups: true})To understand the above syntax, let us create a collection with documents. It might Mar 31, 2017 · dropDupes is deprecated after 2. the unique constraint and avoid inserting duplicates as in the below syntax −db. This might seem a bit confusing because in SQL you only need to use a simple “Group By”, which will display the data fields grouped by certain column like in the following example: Jun 5, 2015 · MongoDB remove duplicate subdocuments inside array based on a specific field. Webinars, white papers, data sheet and more Apr 28, 2020 · So you just wanted to skip duplicate docs as your intention is not update duplicate docs with latest data - So there is no need to use . Could you please confirm if you are using a script to generate id field such that duplicate data is created for the collection for id field? Since the _id from MongoDB are always unique and hence, duplicate data entry is not allowed on _id field. 5. MongoDB‘s rich querying syntax allows flexible yet targeted duplicates deletion: Sep 10, 2021 · Remove Duplicates on mongodb. uuid" WHERE lastCheckin is NOT the most recent OR organizationId is missing. Remove duplicates by field based on secondary field. Identifying duplicate records. collectionName. MongoDB query to remove duplicate documents from a collection. I tried using the following technique to remove the duplicates Sep 10, 2015 · MongoDB remove duplicates from a nested array. MongoDB Find documents which have duplicate propety values. Hot Network Questions Basic, general lexer for a programming language What is a "section verte" in the context of Jan 24, 2022 · Remove duplicate in MongoDB. fnel ohptx vucl fcaq ztcfl xcjjk snsr hdbygv lmlaa trzejx

Mongodb remove duplicates. May 19, 2017 · Remove Duplicates on mongodb.